-
telegraph- David Alter
The telegraph is a device that uses electrical signals to transmit coded text messages, such as Morse code, over wire lines or radio communications -
Telephone- Graham Belt
A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. -
radio - Guillermo Marconi
A radio is a box filled with electronic components that catches radio waves sailing through the air and converts them back into sounds your ears can hear. -
Television - john Logie Baird
Television is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in color, and in two or three dimensions and sound. -
Computer - United states Navy
A computer is a machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. -
Tablet - Alan Kay
A tablet is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry, and a rechargeable battery in a single, thin and flat package. -
Mobile Phone - Martin Cooper
A mobile phone is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
